Answer :

Final answer:

The vapor pressure of ethanol at 50°C can be approximated to be 30 kPa, based on the information available at temperatures 20°C and 63.5°C.

Explanation:

The vapour pressure of a substance, in this case, ethanol, can be estimated if we know the vapour pressures at two different temperatures. The vapour pressure of ethanol at 20.0 °C is 5.95 kPa, and at 63.5 °C, its vapour pressure is 53.3 kPa. This indicates the vapour pressure of ethanol increases with temperature. Using this, we can estimate the vapour pressure of ethanol at the intermediate temperature, 50°C, by interpolating between the two known points.

You can estimate that the vapour pressure of ethanol at 50°C is somewhere between 5.95 kPa and 53.3 kPa. Without having a specific graph or equation to get the exact value, we can't give a precise answer, but from the given multiple-choice options, 30 kPa can be a reasonable approximation considering the nature of the graphed data of vapour pressure against temperature, which is generally a curved line that increases in steepness as the temperature increases.

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